services/inputflinger/reader/mapper/TouchpadInputMapper.h

/*
 * Copyright 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <memory>

#include <PointerControllerInterface.h>

#include "EventHub.h"
#include "InputDevice.h"
#include "InputMapper.h"
#include "NotifyArgs.h"
#include "accumulator/CursorButtonAccumulator.h"
#include "accumulator/MultiTouchMotionAccumulator.h"
#include "accumulator/TouchButtonAccumulator.h"

#include "include/gestures.h"

namespace android {

class TouchpadInputMapper : public InputMapper {
public:
    explicit TouchpadInputMapper(InputDeviceContext& deviceContext);
    ~TouchpadInputMapper();

    uint32_t getSources() const override;
    [[nodiscard]] std::list<NotifyArgs> reset(nsecs_t when) override;
    [[nodiscard]] std::list<NotifyArgs> process(const RawEvent* rawEvent) override;

    void consumeGesture(const Gesture* gesture);

private:
    [[nodiscard]] std::list<NotifyArgs> sync(nsecs_t when, nsecs_t readTime);
    [[nodiscard]] std::list<NotifyArgs> processGestures(nsecs_t when, nsecs_t readTime);
    NotifyArgs handleMove(nsecs_t when, nsecs_t readTime, const Gesture& gesture);
    [[nodiscard]] std::list<NotifyArgs> handleButtonsChange(nsecs_t when, nsecs_t readTime,
                                                            const Gesture& gesture);

    NotifyMotionArgs makeMotionArgs(nsecs_t when, nsecs_t readTime, int32_t action,
                                    int32_t actionButton, int32_t buttonState,
                                    uint32_t pointerCount,
                                    const PointerProperties* pointerProperties,
                                    const PointerCoords* pointerCoords, float xCursorPosition,
                                    float yCursorPosition);

    std::unique_ptr<gestures::GestureInterpreter, void (*)(gestures::GestureInterpreter*)>
            mGestureInterpreter;
    std::shared_ptr<PointerControllerInterface> mPointerController;

    CursorButtonAccumulator mCursorButtonAccumulator;
    MultiTouchMotionAccumulator mMotionAccumulator;
    TouchButtonAccumulator mTouchButtonAccumulator;
    int32_t mMscTimestamp = 0;

    bool mProcessing = false;
    std::vector<Gesture> mGesturesToProcess;

    // The current button state according to the gestures library, but converted into MotionEvent
    // button values (AMOTION_EVENT_BUTTON_...).
    uint32_t mButtonState = 0;
    nsecs_t mDownTime = 0;
};

} // namespace android